CN112352247A

CN112352247A - Method of using shielded RFID strap with RFID tag design

Info

Publication number: CN112352247A
Application number: CN201980040920.7A
Authority: CN
Inventors: I·福斯特; N·霍沃德; E·迈金尼斯
Original assignee: Avery Dennison Retail Information Services LLC
Current assignee: Avery Dennison Retail Information Services LLC
Priority date: 2018-04-20
Filing date: 2019-04-19
Publication date: 2021-02-09
Anticipated expiration: 2039-04-19
Also published as: WO2019204694A1; JP2021522572A; JP7377816B2; US11120323B2; US20190325285A1; EP3782077A1; BR112020021423A2

Abstract

Methods of using shielding tape with RFID tag designs are disclosed. Specifically, in one embodiment, an RFID device includes a bridge conductor that couples an antenna and a pair of strap pads together. Thus, the coupling between the bridge conductor and the strip conductor, the coupling between the bridge conductor and the antenna conductor, and the coupling between the antenna conductor and the strip conductor increase the overall capacitance of the RFID strap device. Furthermore, the presence of the bridge conductor also reduces the area occupied by a given inductance and provides a higher effective capacitance when the bridge strip is connected to the antenna.

Description

Method of using shielded RFID strap with RFID tag design

Cross Reference to Related Applications

This application claims priority and benefit from U.S. provisional utility patent application No. 62/660,498 filed on 20/4/2018, the entire contents of which are incorporated herein by reference.

Technical Field

The present invention generally relates to methods of using shielding RFID tapes with radio frequency identification ("RFID") tag designs and the resulting devices. In particular, the method allows for adding capacitance to the capacitance of the attached RFID strap to reduce the amount of inductance required to resonate at a desired frequency. The method is particularly applicable to RFID tape devices. The present description is therefore specifically concerned with this. However, it should be understood that aspects of the method of the present invention are equally applicable to other similar applications and devices.

Background

RFID utilizes magnetic, electric, or electromagnetic fields transmitted by a reader system to identify itself and, in some cases, provide additional stored data. RFID tags typically include a semiconductor device, often referred to as a "chip," on which a memory and operating circuitry connected to an antenna are formed. Typically, RFID tags are used as transponders to provide information stored in a chip memory in response to a radio frequency ("RF") interrogation signal received from a reader (also referred to as an interrogator). In the case of a passive RFID device, the energy of the interrogation signal also provides the energy required to operate the RFID device.

RFID tags are typically formed by connecting an RFID chip to some form of antenna. The types of antennas are very diverse, as are the methods used to construct the antennas. One method of construction for making RFID tags is to use a strap, which is a relatively small device, with an RFID chip connected to two or more conductors that may be coupled to an antenna. The coupling may be achieved using a combination of conductive connections, electric field connections, magnetic connections, or coupling methods. Another approach in the art is direct chip attach, in which the chip is attached directly to the antenna without the use of any sort of tape or other means to facilitate connection of the chip to the antenna.

RFID tags may be incorporated or attached to items to be tracked. In some cases, the label may be attached to the exterior of the article by adhesive, tape, or other means, and in other cases, the label may be inserted into the article, for example contained in a package, located in a container of the object, or sewn into a garment. RFID tags can be manufactured with a unique identification number, which is typically a simple serial number of a few bytes, with check bits attached. The identification number is incorporated into the tag during manufacture. The user cannot change the serial number/identifier number and the manufacturer ensures that each serial number is used only once. Such read-only RFID tags are typically permanently attached to the item to be tracked and, once attached, the serial number of the tag is associated with its host item in a computer database.

Many RFID antenna types require a resonating element as part of the overall structure. The resonant element is typically a combination of an inductance formed as part of the antenna and a capacitance of the RFID chip and is capable of performing many different functions. For example, the resonant element may be part of a network that matches the impedance of the chip and antenna to achieve optimal power transfer or magnetically couples to the reader system at or near the resonant frequency.

Disadvantageously, a limitation of current RFID tag designs is achieving the desired resonance in a relatively small area. The chip capacitance must be combined with the inductance according to the known resonant frequency formula: f_res1/(2 π SQRT (LC)), where L is the induction intensity (in Henry) related to the length of the wire or flat conductor strip and its diameter/width, F is the frequency (in Hertz), and C is the capacitance (in farad).

To achieve a given inductance, a certain amount of length and width must be included as part of the RFID antenna to resonate the chip capacitance. Narrowing the lines requires tighter manufacturing tolerances and increased resistance, which increases the amount of energy lost in the structure, thus reducing the efficiency of the RFID tag and its operating range. In RFID antennas, the inductor is typically folded to fit within the area where both ends are connected to the RFID strap/chip.

Therefore, it would be advantageous to have a method of adding capacitance to the capacitance of the attached RFID strap to reduce the amount of inductance required to resonate at a desired frequency. The present invention discloses a method to increase the capacitance by using a shielding tape with an RFID tag design. Specifically, the RFID strap arrangement includes a bridge conductor that couples an antenna and a pair of strap pads together. This coupling between the conductors increases the overall capacitance of the RFID strap arrangement. Furthermore, the presence of the bridge conductor also reduces the area occupied by a given inductance and provides a higher effective capacitance when the bridge strip is connected to the antenna.

Disclosure of Invention

The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed innovation. This summary is not an extensive overview and is not intended to identify key/critical elements or to delineate the scope thereof. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is presented later.

The subject matter disclosed and claimed herein, in one aspect thereof, includes a method of increasing capacitance by incorporating a second bridge conductor into an RFID strap device. More specifically, the RFID strap arrangement includes a bridge (or second) conductor coupled to a strap (or first) conductor by a separating dielectric. The RFID strap device is also coupled to a separate antenna conductor on the substrate. The antenna may be made of aluminum foil and the substrate is typically paper. Further, the second bridge conductor, the first strip conductor, and the antenna conductor overlap each other to provide a common area with a separate dielectric and form a plurality of capacitors.

In another embodiment, the area of the bridge conductor is modified by a cutting process to change the bridge capacitance. For example, if the area of the bridge conductor is larger than the area of the pair of pads, a high bridge capacitance is provided. If the area of the bridge conductor is smaller than the area of the pair of pads, a low bridge capacitance is provided.

According to some embodiments of the present disclosure, a Radio Frequency Identification (RFID) device includes: a first conductor comprising at least one pair of tape pads and an RFID chip connected to the at least one pair of tape pads; a second conductor; and a dielectric between the first conductor and the second conductor, wherein the first strip conductor is coupled to the antenna conductor.

In some embodiments, at least one pair of strap pads is coupled to the antenna conductor by a conductive adhesive. In other embodiments, at least one pair of the bond pads is capacitively coupled to the antenna conductor. In some embodiments, the antenna conductor is attached to the substrate.

In some embodiments, the second conductor is a bridge. In some embodiments, the second conductor, the first strip conductor, and the antenna conductor overlap one another to provide a common area having a separate dielectric and a plurality of capacitors having a value. In other embodiments, the values of the plurality of capacitors are determined by: (i) a common area, (ii) a dielectric constant of a material between the antenna conductor, the first strip conductor, and the second conductor, and (iii) an amount of distance separating the antenna conductor, the first strip conductor, and the second conductor.

In some embodiments, the area of the second conductor is greater than the area of the pair of band pads. In other embodiments, the area of the second conductor is less than the area of the at least one pair of tape pads.

In some embodiments, the second conductor is modified by a cutting process. In other embodiments, the shape and area of the second conductor is modified by a cutting process. In some embodiments, the cutting process is a laser cut line.

In some aspects of the invention, a Radio Frequency Identification (RFID) band device comprises: a first strip conductor including a pair of band pads and an RFID chip connected between the pair of band pads; a second bridge conductor; and a dielectric between the first strip conductor and the second bridge conductor, wherein the first strip conductor is coupled to the antenna conductor, and further wherein the second bridge conductor, the first strip conductor, and the antenna conductor overlap one another to provide a common area having the separate dielectric and a plurality of capacitors having a value.

In some embodiments, the values of the plurality of capacitors are determined by: (i) a common area, (ii) a dielectric constant of a material between the antenna conductor, the first strip conductor, and the second bridge conductor, and (iii) an amount of distance separating the antenna conductor, the first strip conductor, and the second bridge conductor.

In some embodiments, the area of the bridge conductor is greater than the area of the pair of tape pads. In an alternative embodiment, the area of the bridge conductor is less than the area of the pair of pads. In some embodiments, the second bridge conductor is modified by a cutting process.

The present disclosure also contemplates a method of manufacturing a shielding tape with increased capacitance on an RFID device, the method comprising providing a bridge conductor, a pair of band pads, and an antenna conductor, attaching the antenna conductor to the pair of band pads, and connecting the bridge conductor to the pair of band pads.

In some embodiments, a method of manufacturing a shielding tape with increased capacitance on an RFID device further includes modifying one or more of a shape and an area of a bridge conductor by a cutting process. In some embodiments, the cutting process is performed before attaching the antenna conductor to the pair of tape pads. In other embodiments, the cutting process is performed after attaching the antenna conductor to the pair of tape pads.

To the accomplishment of the foregoing and related ends, certain illustrative aspects of the disclosed innovation are described herein in connection with the following description and the annexed drawings. These aspects are indicative, however, of but a few of the various ways in which the principles disclosed herein can be employed and is intended to include all such aspects and their equivalents. Other advantages and novel features will become apparent from the following detailed description when considered in conjunction with the drawings.

Drawings

Fig. 1A shows a side perspective view of an RFID strap apparatus in accordance with the disclosed architecture, wherein a second conductor is attached to an opposite side of the strap medium.

Fig. 1B illustrates a top perspective view of an RFID strap apparatus in accordance with the disclosed architecture, wherein a second conductor is attached to an opposite side of the strap medium.

Fig. 2 illustrates a side perspective view of an RFID strap apparatus in accordance with the disclosed architecture, wherein an additional bridge conductor is connected to an RFID antenna.

Fig. 3 illustrates a top perspective view of an RFID strap apparatus having a plurality of conductive layers, a bridge layer, strap pads, and antenna conductors in accordance with the disclosed architecture.

Fig. 4 illustrates a side perspective view of an RFID strap arrangement showing the coupling between the strap, antenna, and bridge conductor in accordance with the disclosed architecture.

Fig. 5A illustrates a top perspective view of an RFID strap apparatus showing a toroidal inductor in accordance with the disclosed architecture.

Fig. 5B illustrates a top perspective view of an RFID strap assembly having a bridge strap that reduces the size of the toroidal inductor in accordance with the disclosed architecture.

Fig. 6A illustrates a top perspective view of an RFID strap apparatus with standard straps showing folded dipole lengths according to the disclosed architecture.

Fig. 6B illustrates a top perspective view of an RFID strap apparatus having a bridge strap that increases folded dipole length in accordance with the disclosed architecture.

Fig. 7A illustrates a top perspective view of an RFID strap apparatus in accordance with the disclosed architecture, wherein the shielding element is larger than the strap conductor.

Fig. 7B illustrates a top perspective view of an RFID strap apparatus in accordance with the disclosed architecture, wherein the shielding element is smaller than the strap conductor.

Fig. 8 illustrates a top perspective view of an RFID strap apparatus in accordance with the disclosed architecture, wherein the bridge conductors are modified by laser cutting lines.

Detailed Description

The present invention is now described with reference to the drawings, wherein like reference numerals are used to refer to like elements throughout. In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding thereof. It may be evident, however, that the present invention may be practiced without these specific details. In other instances, well-known structures and devices are shown in block diagram form in order to facilitate describing them.

A method of using a shielding tape with an RFID tag design is disclosed. In particular, RFID strap devices include a bridge conductor that couples together an antenna and at least a pair of pads (also referred to herein as strap pads or strap conductors). Thus, the coupling between the bridge conductor and the strip conductor, the coupling between the bridge conductor and the antenna conductor, and the coupling between the antenna conductor and the strip conductor increase the overall capacitance of the RFID strap device.

The amount of capacitance increase depends on one or more of the following: (i) overlapping regions between (a) the bridge conductor and the strip conductor, (b) the bridge conductor and the antenna conductor, and (c) the antenna conductor and the strip conductor; a dielectric constant and a thickness of an intermediate material between each of the strip conductor, the bridge conductor and the antenna conductor. In most applications, it is desirable to increase the capacitance of the unshielded chip attached to the strap by a factor of 4, since higher values will make the design of a broadband antenna for coupling to the RFID tag of the strap difficult. For example, a typical tape for a UHF RFID tag may have a capacitance of about 1pF, and thus the shielding tape will have a capacitance in the range of between 1pF and 4 pF.

The increased capacitance provided by the presence of the bridge conductor may have a number of beneficial effects on the design of the RFID tag with which it is used. For example, having an increased charged capacitance may reduce the inductance required to achieve resonance, as further described herein.

UHF RFID tags typically include an inductive element as part of an antenna connected to a strap that is intended to resonate at a given frequency (e.g., the intended operating frequency of the RFID tag). The inductor is typically made as a planar loop with a given conductor width and area. Since the increased charged capacitance, which can be achieved by using a bridge conductor, reduces the inductance required to achieve resonance, designers can make loops with smaller areas, thereby occupying less total area available for the rest of the antenna structure, thus allowing improved performance to be achieved. Alternatively, using a loop with a smaller area may allow a wider conductor to be used. Wider conductors can provide many benefits; for example: the resistance is low, so that when current flows at the working frequency, the energy loss is less; different manufacturing methods may be used, for example, an etching process may be required to define a 0.2mm wire, while a cutting process may be used for a 1mm wire, advantageously, the cost of the cutting process is lower than the etching process.

Referring initially to the drawings, fig. 1A-1B illustrate an RFID device 100 that includes at least a second conductor 102. The second conductor may be, for example, but not limited to, a bridge conductor or a shield conductor. Although this disclosure discusses the use of the second conductor 102, this disclosure also contemplates the use of any number of additional conductors and is not limited to a particular number. Specifically, the RFID device 100 includes first and second conductors 102 (also referred to as bridge conductors or shield conductors), the first conductor being at least one pair of conductor pads 106, and a dielectric 104 located between the second conductor 102 and the at least one pair of conductor pads 106. In some embodiments, the first conductor may be a ribbon.

The second conductor 102 may be any suitable conductor known in the art, such as, but not limited to, aluminum foil, copper foil, or printed conductive ink. Furthermore, the second conductor 102 may be any suitable size, shape, and configuration known in the art without affecting the overall concept of the present invention. Those of ordinary skill in the art will appreciate that the shape and size of the second conductor 102 as shown in fig. 1A-1B is for illustrative purposes only, and that many other shapes and sizes of the second conductor 102 are well within the scope of the present disclosure. Although the dimensions (i.e., length, width, and height) of the second conductor 102 are important design parameters for achieving good performance, the second conductor 102 may be any shape or size that ensures optimal performance during use.

The RFID device 100 also includes an RFID chip 108, the RFID chip 108 preferably being located between the conductor pads 106 and mounted on a suitable carrier (shown in fig. 2), such as plastic, paper, fabric, corrugated cardboard, foam, or any other suitable material. A second conductor 102 is then attached to the other or opposite side of the tape medium 104 from the conductive pad 106 and the RFID chip 108, coupled to a pair of conductor pads 106 and possibly to a separate antenna conductor.

As shown in fig. 2, the RFID device 200 includes a bridge conductor 202 (also referred to as a second conductor or shield conductor) connected to or in communication with an antenna conductor 210. Specifically, bridge conductor 202 is coupled to a conductor, such as strip conductor 206, and includes a dielectric 204 located between bridge conductor 202 and strip conductor 206. The strip conductor 206 also includes at least a pair of strip pads 208, with an RFID chip 214 located between the strip pads 208. The strap pad 208 may then be attached to the antenna conductor 210 by any suitable method known in the art, such as applying a conductive adhesive or a non-conductive adhesive (not shown). When attached to the antenna conductor 210 by a conductive adhesive, the strap pad 208 may be coupled to the antenna conductor by the conductive adhesive. In other embodiments, the coupling between the antenna conductor 210 and the strap pad 208 is achieved by capacitive or any other suitable coupling method known in the art, such as magnetic coupling. For example, when the magnetic loop is adjacent to the antenna, the magnetic loop may be coupled to the antenna, such as antenna conductor 210. Additionally, the antenna conductor 210 may be made of any suitable material known in the art, such as, but not limited to, aluminum foil, copper foil, or printed conductive ink. The antenna conductor 210 may then be attached to the antenna base layer 212 to complete the RFID strap apparatus 200. In another embodiment shown in fig. 3, an RFID device 300 utilizing a strap includes at least three conductive layers: a bridge layer 302; a pair of tape pads 304 to which an RFID chip 306 is attached; and an antenna conductor 310. Although fig. 3 illustrates the use of three conductive layers, the present invention is not limited to any number of conductive layers. The three conductive layers (302, 304, and 310) overlap each other to provide a given common area (mutual area)308 with separate dielectrics, thereby forming a plurality of capacitors. The value of each capacitor is determined at least in part by the common region 308, the separation distance, and the dielectric constant of the material between the conductive layers (302, 304, and 310). In addition, a plurality of small fringe capacitances are formed on the RFID device 300, but typically these capacitances are less than the overlap capacitance created by the conductive layers (302, 304, and 310).

Additionally, fig. 4 discloses an RFID device 400 and the coupling between the strap conductor 406, the antenna conductor 408, and the bridge conductor 402. As disclosed, this coupling is achieved not by a conductive dielectric 404 but by capacitance. C_SAA coupling 410 between the strip conductor 406 (i.e., strip pad) and the antenna conductor 408 is shown. In one embodiment, a thin dielectric adhesive is used for the coupling, so that the capacitance is large. C_BSRepresenting the coupling 412, C between the bridge conductor 402 and the strip conductor 406_BA A coupling 414 between the bridge conductor 402 and the antenna conductor 408 is shown. C_CIs the capacitance of the RFID chip 416. Generally, consider C_SARelatively large compared to other capacitances, C_BSAnd C_BAAre in fact parallel; thus, C_CThe capacitance added in parallel across the terminals can be represented by the following equation: (1/C)_B)＝2((C_BA+C_BS) Wherein, C)_BIs the total capacitance added due to the presence of the bridge conductor 402 and the capacitance presented to the antenna conductor 408 and the inductor structure as part of the resonant element increases to C_C+C_B. Alternatively, the coupling may be made conductive by using an isotropic conductive paste, an anisotropic conductive paste, thermal, laser or ultrasonic welding, bonding or other methods.

Fig. 5A discloses an aspect of the invention of the present disclosure, in particular, a toroidal inductor 502 with a standard band. The toroidal inductor 502 is shown with typical inductor dimensions to provide a desired resonant frequency, where C_CIs the capacitance of the RFID chip 500. In contrast, fig. 5B discloses a toroidal inductor 506 having a bridge conductor and thus a higher capacitance. For example, in one embodiment, at UHF frequencies, the capacitance of the toroidal inductor is about 1pF to 4 pF. Since the bridge conductor increases the capacitance of the toroidal inductor, it also advantageously reduces the inductor size required to provide the desired resonant frequency, where C_CIs the capacitance of the RFID chip 500, and C_BIs the increased total capacitance 504 due to the presence of the bridge conductor. Thus, assuming that the line width is constant, the area occupied by a given inductance is reduced due to the presence of the bridge conductor and the higher effective capacitance that is given when the bridge conductor is connected to the antenna.

As shown in fig. 6A, a loop region or center matched resonator 602 is shown without a bridge conductor. Specifically, folded dipole length 600 is shown within a given region 608 having standard bands. Fig. 6B discloses a loop area or center matched resonator 606 with a bridge conductor. Specifically, folded dipole length 604 is shown within a given region 608 having a bridge conductor. Thus, the bridge conductor is used on the antenna that needs to be adapted within a given area 608The benefit of (c) is shown as an increase in folded dipole length 604. In particular, for the efficiency and performance of the dipole antenna, the RFID chip, and the ease of matching, the antenna is related to how much dipole length can fit within a given area 608. Thus, in fig. 6A, without the bridge conductor, the center matched resonator 602 occupies a relatively large area, so that the space available for the folded dipole length 600 is reduced, and thus a smaller length can be used. For example, in a 70mm x 14.5mm antenna using bridgeless tape (i.e., bridgeless conductor), the central loop (i.e., inductor) may occupy 32mm x 8mm, i.e., 256mm²(ii) a On the other hand, using a band with twice the capacitance may require 16mm x 8mm (i.e., 128 mm)²) The central loop (i.e., inductor). As a result, 128mm²May be used for other elements of the antenna, such as dipoles. In fig. 6B, the size of the center matched resonator 606 is reduced by using a bridge conductor, so a larger folded dipole length 604 can be adapted.

In an alternative embodiment shown in fig. 7A-7B, the size and shape of the shield elements or

bridge conductors

700 and 704 above the strap pad 702 may vary according to the desires and/or needs of the user. For example, as shown in fig. 7A, the area of the bridge conductor 700 is much larger than the area of the strap pad 702, thereby providing a high bridge capacitance. In contrast, in fig. 7B, the size of the bridge conductor 704 has been reduced and is much smaller than the area of the strap pad 702, thus providing a lower level of bridge capacitance. Thus, the bridge conductor may be a variable structure that adjusts the bridge capacitance based on the desires and/or needs of the user.

Additionally, as shown in fig. 8, the RFID device 800 includes a bridge conductor 802, the bridge conductor 802 being modifiable by a cutting process, such as by laser or mechanical die cutting, to change the bridge capacitance. In particular, the cutting process is typically a cutting line 804, such as a laser cutting line, but may be any suitable cutting process known in the art. The cutting process may be performed before or after the pair of tape pads 806 and RFID chip 808 are attached to the antenna (not shown). The cutting process may modify the shape and/or area of the bridge conductor 802 and thus allow for varying the bridge capacitance. Changing the bridge capacitance allows tuning of the entire RFID chip 808 and bridge capacitance.

This change in capacitance can be used to accommodate manufacturing tolerances or to shift the operating frequency of the antenna between the two frequency bands. For example, for Ultra High Frequency (UHF) tags, europe uses frequencies between 865MHz to 868MHz, while the united states uses frequencies between 902MHz to 928 MHz. Thus, by using a cutting process to modify the shape and/or area of the bridge conductor 802 to change the bridge capacitance, the same RFID device 800 may be used in two different frequency bands by only changing the bridge capacitance. The use of the same RFID device 800 with a bridge conductor of variable bridge capacitance may advantageously reduce manufacturing and operating costs, as it allows the use of one RFID device design in multiple frequency bands.

What has been described above includes examples of the claimed subject matter. It is, of course, not possible to describe every conceivable combination of components or methodologies for purposes of describing the claimed subject matter, but one of ordinary skill in the art may recognize that many further combinations and permutations of the claimed subject matter are possible. Accordingly, the claimed subject matter is intended to embrace all such alterations, modifications and variations that fall within the spirit and scope of the appended claims. Furthermore, to the extent that the term "includes" is used in either the detailed description or the claims, such term is intended to be inclusive in a manner similar to the term "comprising" as "comprising" is interpreted when employed as a transitional word in a claim.

Claims

1. A Radio Frequency Identification (RFID) device, comprising:

a first conductor comprising at least one pair of tape pads and an RFID chip connected to the at least one pair of tape pads;

a second conductor; and

a dielectric between the first conductor and the second conductor, wherein the first strip conductor is coupled to the antenna conductor.

2. The RFID device of claim 1, wherein the at least one pair of strap pads are coupled to the antenna conductor by a conductive adhesive.

3. The RFID tag of claim 1, wherein said at least one pair of strap pads are capacitively coupled to said antenna conductor.

4. The RFID device of claim 1, wherein the antenna conductor is attached to a substrate.

5. The RFID device of claim 1, wherein the second conductor is a bridge and the second conductor, the first strip conductor, and the antenna conductor overlap one another to provide a common area having a separate dielectric and a plurality of capacitors having a value.

6. The RFID device of claim 5, wherein the values of the plurality of capacitors are determined by: (i) the common area, (ii) a dielectric constant of a material between the antenna conductor, the first strip conductor, and the second conductor, and (iii) an amount of distance separating the antenna conductor, the first strip conductor, and the second conductor.

7. The RFID device of claim 1, wherein the second conductor has an area greater than an area of the pair of strap pads.

8. The RFID device of claim 1, wherein the second conductor has an area that is less than an area of the at least one pair of strap pads.

9. The RFID device of claim 1, wherein the second conductor is modified by a cutting process.

10. The RFID device of claim 1, wherein the shape and area of the second conductor is modified by a cutting process.

11. The RFID device of claim 9, wherein the cutting process is a laser cut line.

12. A Radio Frequency Identification (RFID) strap apparatus, comprising:

a first strip conductor including a pair of band pads and an RFID chip connected between the pair of band pads;

a second bridge conductor; and

a dielectric between the first strip conductor and the second bridge conductor, wherein the first strip conductor is coupled to an antenna conductor, and further wherein the second bridge conductor, the first strip conductor, and the antenna conductor overlap one another to provide a common area having a separate dielectric and a plurality of capacitors having a value.

13. The RFID strap apparatus of claim 12 wherein values of said plurality of capacitors are determined by: (i) the common area, (ii) a dielectric constant of a material between the antenna conductor, the first strip conductor, and the second bridge conductor, and (iii) an amount of distance separating the antenna conductor, the first strip conductor, and the second bridge conductor.

14. The RFID strap apparatus of claim 12 wherein the area of the bridge conductor is greater than the area of the pair of band of pads.

15. The RFID strap apparatus of claim 12 wherein the area of the bridge conductor is less than the area of the pair of pairs of bond pads.

16. The RFID strap apparatus of claim 12 wherein the second bridge conductor is altered by a cutting process.

17. A method of manufacturing a shielding tape with increased capacitance on an RFID device, comprising:

providing a bridge conductor, a pair of bond pads, and an antenna conductor;

attaching the antenna conductor to the pair of band pads; and

attaching the bridge conductor to the pair of band pads.

18. The method of claim 17, further comprising

Modifying one or more of a shape and an area of the bridge conductor by a cutting process.

19. The method of claim 17, wherein the cutting process is performed prior to attaching the antenna conductor to the pair of tape pads.

20. The method of claim 17, wherein the cutting process is performed after attaching the antenna conductor to the pair of tape pads.